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LB1981V Fiches technique(PDF) 6 Page - Sanyo Semicon Device |
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LB1981V Fiches technique(HTML) 6 Page - Sanyo Semicon Device |
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6 / 9 page ![]() LB1981V No. 5917-6/9 Pin number 18 19 20 22 21 Pin name PGOUT Pin voltage Equivalent circuit Pin function FG amplifier output pin. Pin for connecting triangular wave oscillator capacitor. Serves for forced startup waveform generation. Frequency characteristics pin. Connecting a capacitor between this pin and ground serves to prevent closed-loop oscillation in the current control circuitry. (Lower-side output transistor drive current) Frequency characteristics pin. Connecting a capacitor between this pin and ground serves to prevent closed-loop oscillation in the current control circuitry. (Lower-side output transistor drive current) Connecting a capacitor between this pin and ground activates the coil output saturation prevention function. In this condition, the VS pin is controlled for motor voltage control. By adjusting the external capacitor, torque ripple compensation can be varied. Continued from preceding page OSC FC1 FC2 FILTER Continued on next page 18 VCC1 30 µA 30k Ω A10867 19 VCC1 5 µA 2.5 µA10µA 1k Ω A10868 20 VCC1 2k Ω 2k Ω 5k Ω 10k Ω 2s A10869 22 VCC1 10k Ω FC2 A10870 21 2 VCC1 1k Ω 30k Ω 1k Ω 1 1k Ω 29 1k Ω 25 µA A10871 |
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